Unless you're either extremely lucky or live out in the wilderness, there's a chance that you're going to clash with your neighbors at some point. And unfortunately, the odds are good that it'll involve something that never made a difference in your life until they started bothering you about it.
For instance, I had one that seemed to have a very different concept of her property lines than everyone else (including the city). This meant that it wasn't unusual to try and chase away delivery people and technicians who parked in the easement between our houses.
But while every story of neighborly squabbles is different, and that certainly wasn't fun to deal with, some situations rise above the others by simply seeming unbelievable.